Micrometer and gage.



\ 1 No. 648,390. `humm May-1,1900.

c. E. 00E.

IIIGROMETER AND GAGE.

(Application med Jan. 5, 1900.)

(No Model.)

UNITED Srrrrss PATENT OFFICE.-

CI-IARLES E. COE, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE BHCROMETER- CALIPFR COMPANY, OF SAME PLACE.

MICRONIETER AND GAGE.

SPECIFICATION forming part of Letters Patent No. 648,390, dated May 1, 1900.

Application tiled January 5, 1900. Serial No. 451. (No model.)

To all whom t may concern:

Be it known that I, CHARLES E. COE, a citizen of the United States, residing at St. Louis,

in the State of Missouri, have invented certain.

new and useful Improvements in Micrometers and Gages; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in gages, and more particularly to that variety thereof designated a micrometer, the use of said instrument, as is well known, being for the purpose of promptly measuring the diameter and truing the circumferential face of a shaft, mandrel, or other object, the instrument being especially desirable andvaluable for use in connection with turning-lathes.

A further object of my invention is to combine with said instrument a feature of construction which will fit it for other uses, aS for a sheet-metal gage, and also for measuring drills and the diameters of wires.

A further object of my invention is to provide an instrument ofthe character specified the parts of which may be very cheaply and expeditiously manufactured and assembled in their respective operative positions ready for use.

A further object is to so form the several parts of my invention that the same may be individually removed and replaced without disturbing the other parts in case it may be desirable to do so.

A further object is to provide means for compensating for the wear upon the calipering-points, as said points shall become worn away incident to the use thereof.

Other objects and advantages will be made fully apparent from the following specification, considered in connection with the accompanying drawings, in whichv Figure 1 is a side elevation of my combined micrometer and gage complete. Fig. 2 is a similar view to that presented in Fig. 1, eX- cepting that certain parts are shown in central longitudinal section.

For convenience in referring to the several details of my invention and the cooperating features numerals will be employed, of which 1 is the body portion proper of my improved micrometer and gage, which is provided with the graduated end 2 and with the usual curved lip or terminal branch 3, forming one of the caliper-points, as indicated by the numeral 4, said terminal branch being curved substant-ially as shown, while the outer edge thereof is provided with a series of graduated slots 5, each of which terminates in a cylindrical bore or aperture 6, the purpose of said construction beinghereinafterspecically set forth. The body portion is provided with the anchoring-points 7, to which I secure, as by the set-screws S, the barrels 9, through which is designed to loosely play the threaded shaft 10, which is provided with the pointed terminal 11, forming a calipering-point designed to act as the complement of the point 4.

In order to control the threaded shaft 10 and enable the operator to readily reciprocate the same within its supporting-barrels 9, I provide the knurled or thumb nut 12, which, as will be seen by reference to Fig. 2, is threaded on said shaft, and it is obvious that by a proper rotation of said nut said shaft may be thrust inwardly toward the point 4 or withdrawn therefrom, asdesired.

The graduated end 2 is, as will be seen by reference to the drawings, disposed parallel with the threaded shaft 10, and designed to cooperate with the graduations upon said terminal 2 is the graduated indicator or index wheel 13.

It will be understood that the graduations upon the branch 2 and the wheel 13 are so formed that they will cooperate or register with each other, the graduations upon the index-wheel being so designated that the position occupied by the point 11 with respect to the point 4 may be readily determined at a glance.

In order to compensate for wear upon the points 4 and 11, I mount the index-wheel 13 as shown in Fig. 2, in which it willbe observed that the threaded shaft 1O is reduced at its outer free end, thereby forming the stem or lug 14, While theindeX-wheel 13 is provided with a suitable recess designed to loosely receive said lug, said'wheel being held in place by the setscrew 15. Sufficient play and is provided with a threaded bore designed to receive the threaded shaft 10, and itis obvious that by a proper adjustmentof vthe setnscrew`15 the jam-nut 17 will reliably secure and hold the index-wheel 13 in an adjusted position. A i y If for any, reason it is desired to move the index-wheel in either direction upon its jour- .nal or lug 14, the jam-nut 17 is turned so that t aperture and reading the size indicated :by f proper number or letter adjacent to said aper- `3S it will move toward the knurled nut 12, which will release the wheel 13,when said wheel may be readily adjusted by a proper rotation .of the set-screw 15, and after such adjustment hasbeen effected the jam-nutis turned tightly against the index-wheel, thereby securing it in position and holding it against casualdis-V placement until said jam-nut is loosened. j

By means of the graduated slots it will be observed that the ,thicknessv of sheet `metal may Vbe Areadily determined, since said slots may be properly designated by numbersor letters.

' The apertures 6 will enable the diameterof a drill or wire to be readily determined by -in-1 serting a drill or -wire in its corresponding ture.

It will beseen that either fof the barrels 9 gmaybequickly replaced by removal of the screws or rivets 8, While the other parts of my instrument may, if desired, be quickly removed and restored.

` While I have described thepreferred construction and arrangement of parts necessary `to provide myV improved instrument, it will be understood that I desire to comprehend in 4this application the substantial equivalent thereof.

' Having thus fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is@

In a combined micrometer and gage, a body portion havinga graduated and a curved terminal, the latter being provided with gradnated slots merging into graduated apertures; barrels secured to said `body portion and loosely receiving a threaded shaft; a thumbnut controlling said shaft; agraduated indexwheel cooperating with the graduations upon said body portion adjustably secured upon the end of said threadedshaft anda jam-nut fitting the threads of said shaft and designed to bear against said graduated wheelwhen the latter hasjbeen adjusted in the desired position all combined in the manner specified and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES E. COE.

Witnesses:l

- E. O. BARTHOLOMEW, -f

JorrN G. MANNING. 

